User interface



FIG. 1 is a front perspective view of an ornamental design for a user interface;

FIG. 2 is a rear perspective view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a first side view thereof;

FIG. 6 is a second side view thereof;

FIG. 7 is a top view thereof; and,

FIG. 8 is a bottom view thereof.

The broken lines shown in FIGS. 1-8, that are immediately adjacent to the shaded areas, and define unshaded regions, represent the bounds of the first embodiment, while all other broken lines are directed to environment and are for illustrative purposes only; the broken lines form no part of the first embodiment. 

The ornamental design for a user interface, as shown and described. 